11111331021 has 16 divisors (see below), whose sum is σ = 17325310464. Its totient is φ = 6201672624.

The previous prime is 11111330999. The next prime is 11111331047. The reversal of 11111331021 is 12013311111.

11111331021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11111331021 - 2⁶ = 11111330957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111331421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6151551 + ... + 6153356.

It is an arithmetic number, because the mean of its divisors is an integer number (1082831904).

Almost surely, 2^11111331021 is an apocalyptic number.

It is an amenable number.

11111331021 is a deficient number, since it is larger than the sum of its proper divisors (6213979443).

11111331021 is a wasteful number, since it uses less digits than its factorization.

11111331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12304960.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 11111331021 its reverse (12013311111), we get a palindrome (23124642132).

The spelling of 11111331021 in words is "eleven billion, one hundred eleven million, three hundred thirty-one thousand, twenty-one".